Jordans cereal bars and Warburtons bread have been found to contain traces of glyphosate – a weedkiller that campaigners say poses a risk to human health. Andrew Wasley reports

They are the proud sponsors of Channel 4’s River Cottage series and widely recognised for their commitment to the environment, promoting ‘conservation grade’ farming where growers must dedicate portions of their land to benefit wildlife.

But Jordans – the leading manufacturer of breakfast cereals and cereal snack bars – is reviewing its farming methods after some of its products were found to contain residues of a controversial herbicide that campaigners say is potentially harmful to human health, The Ecologist has learnt.

The company has pledged to review its use of glyphosate, a powerful weedkiller, after a pressure group analysed the results of tests carried out by the Government’s official Pesticides Residues Monitoring Programme on bread, bakery products, cereal bars and other foodstuffs.

According to GM Freeze, 100% of the Jordans cereal bars tested were found to contain glyphosate. The group also says that at least 85% of tested products made by Warburtons – the well known bread company – contained traces of the herbicide. The testing was carried out in 2012 but the results were only recently published in full.

The Government’s sampling programme is not exhaustive and is designed to provide only a snapshot of residues in a variety of products at a specific time: of forty Warburtons products sampled last year, 34 tested positive for glyphosate according to the data, whilst all five samples of Jordans cereal bars tested in 2012 were found to contain the herbicide.

White, brown and wholemeal Warburtons loaves sampled were found to contain glyphosate, as well as crumpets produced by the company; the items were sold in leading supermarkets including Tesco, Morrisons and Asda. Among the cereal bars testing postive for the weedkiller were Jordans cranbury and raspberry, crunchy honey and almond, and red berry varieties, purchased in Sainsburys and Tesco.

Although the residues found in each case were very small – between 0.1 and 0.8 mg/kg, well below the permitted EU maximum residue levels (MRLs) for cereal crops which currently span 10 – 20 mg/kg, (there is currently no MRL for bread and bakery products themselves) – campaigners say the volume of positive tests for both companies raises questions about the use of glyphosate in their supply chains.

“We are concerned because glyphosate has been implicated as a potential endocrine disruptor,” Helena Paul, from GM Freeze told The Ecologist. “This means that it may produce adverse effects on human and animal development and reproduction, the immune system and the nervous system and these may occur at very low doses.”

The group says there is a growing body of evidence suggesting the herbicide could be linked to health problems and that there should be a ban on its use on food crops and a review of the MRLs to minimise exposure to consumers.

Environmentalists point to studies which they say found that glyphosate herbicides can be toxic to humans, even at lower doses, affecting both embryonic and placental cells.

“Laboratory tests on rats have highlighted damage to testosterone levels in male offspring, while studies on cell cultures found that glyphosate blocks receptors for male sex hormones, and that it inhibits production of oestrogen,” according to Friends of the Earth, which published a report on the issue earlier this year.

Manufacturers of glyphosate vigorously dispute such claims however, stating that the herbicide is safe and accusing campaigners of touting flawed research, or manipulating the findings to suit their own agenda:

“Extensive animal and in-vitro (test-tube) data has demonstrated that glyphosate does not cause cancer or tumors, nor is an endocrine disrupter,” Thomas Helscher, spokesman for Monsanto, a major supplier of glyphosate products, told The Ecologist.

Last month, the prominent peer-reviewed Journal of Food and Chemical Toxicology retracted its publication of controversial research by Professor Gilles-Eric Seralini, an expert in molecular biology, which had claimed that rats fed a diet of GM maize, or exposed to glyphosate, for two years, developed higher levels of cancers and died earlier than controls.

The study had been repeatedly criticised by the agribusiness industry and academics, who said it contained methodological flaws, was scientifically substandard, and its findings sensationalised.

An earlier review by the European Food Safety Authority had also concluded that Seralini’s research could not be regarded as scientifically sound because of inadequacies in the design, reporting and analysis of the study.

“The Seralini study does not provide information which calls into question the extensive safety evaluations of glyphosate or Roundup herbicides,” said Helscher.

Glyphosate is routinely sprayed on many cereal crops to kill off weeds and maximise yields. It is used widely on conventional crops in the UK. Globally its usage on Genetically Modified (GM) soya and maize is particularly prevalent as the crops are engineered to be resistant to the chemical, killing the weeds but leaving the crop plants unaffected.

GM Freeze believes the most likely cause of the glyphosate found in the 2012 samples is crop dessication – where farmers spray crops with the herbicide just prior to harvesting in order to make combining easier.

Whilst there is no suggestion of any wrongdoing on the part of Jordans or Warburtons, campaigners point out the frequency of their positive results compare unfavourably with major competitors.

In the bread category, according to the GM Freeze analysis, less than 15% of Hovis samples tested positive for glyphosate, with 28% of Kingsmill products found to contain residues. Four samples taken of Tracker bars tested negative for the herbicide and just one of eleven Nature Valley items tested contained the chemical, the group claims.

“The companies should ask questions about the use of glyphosate and other herbicides and pesticides in production, because we can now see how frequently residues of glyphosate appear in food,” said Paul.

“Convenience in production is not the only criterion – people need healthy and nutritious food, and companies need to be proactive in protecting consumer interests in health and wellbeing, especially in complex issues where most consumers cannot be expected to be knowledgeable themselves.”

Jordans confirmed that glyphosate is permitted for use on its ‘conservation grade’ farms and said it is typically used around 8 weeks prior to planting crops.

In a statement the company said: “The results identified within this survey are a fraction (c. 0.5% – 1.5%) of the permitted Maximum Residue Level, or MRL [for cereal crops], and it is important to remember that this level is itself assessed and set by European regulators on the basis of very detailed scientific evidence.”

“However, we respect the fact that GM Freeze has gathered detailed information in support of its claims; therefore we have asked internal and external experts to review this, together with known scientific data, and provide us with an assessment of whether we need to adopt a different position.”

The company said it would be asking the Guild of Conservation Grade Producers to review the GM Freeze report and provide an assessment of whether they believe Jordans needs to make any changes to its crop management protocols as a result.

“Our Head of Technical will also review the available scientific data relating to glyphosate and advise whether he feels that we should be stipulating a Maximum Residue Level lower than that specified currently within relevant legislation,” the statement continued. “Our newly designated ‘Sustainability Governance Committee’ will evaluate this information in the New Year.”

Paul Murphy, Jordans CEO, earlier said he would request his crop development manager “explore whether it might be possible to gain agreement on the use of an alternative means of crop management other than the use of glyphosate,” in a forthcoming annual meeting of Jordan’s farm suppliers.